Clamp.



No. 832,464. 'PATENTED OCT. 2, 1906. E. R. BRICKSON. CLAMP.

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UNITED STATES PATENT OFFICE.

ERICK R. ERIOKSON, OF NEW YORK, N. Y., ASSIGNOR OF ONE-HALF TO HENRYWYNELL, OF NEW YORK, N. Y.

' CLAMP.

Specification of Letters Patent.

Patented Oct. 2, 1906.

To all whom it may concern Be it known that I, ERICK R. ERlCKSON, a

the city of New York, borough of the Bronx,

in the county and State of New York, have invented a new and ImprovedClamp, of which the following is a full, clear, and exact description.

This invention relates to clamps such as used by artisans, andespecially by wood.- workers for clamping the Work.

The object of the invention is to produce a clamp of simple constructionthe jaws of which may be readily separated. to any desired distance, soas to apply them to clamp an object held therebetween.

The invention consists in the construction and combination of parts tobe more fully described hereinafter and particularly set forth in theclaims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a side elevation, partially in section, of a clampconstructed according to my invention. Fig. 2 is a cross section takenon the line 2 2 of Fig. 1 and representing the object which is beingclamped as partly broken away; and Fig. 3 is a section on the line 3 3of Fig. 1, but upon an enlarged scale. In this view only a portion ofthe body of the clamp is shown.

Referring more particularly to the parts,

1 and 2 represents a pair of aws of common form. The jaw 1, which may beconsidered as the fixed jaw of the clamp, is provided with a bore 3,disposed in the plane in which the clamp is applied. This bore 3 isprovided with a counterbore 4, which constitutes a seat for an expandedhead 5, formed on the extremity of a tubular handle 6, which handle isinternally threaded, as at 7. As shown, the outer face of the head 5 ispreferably substantially flush with the outer face of the jaw 1, and thehandle is held to the jaw by means of a saddle-clip 8, the saidsaddleclip having the form shown in 2, present ing a concave edge 9,which is adapted to lie adjacent to the side of the handle, thesaddleclip being attached to the jaw by means of a suitable screw 1.0 orsimilarfastening. At the butt 11 of the jaw 1. a similar bore 12 isprovided; but this bore is provided with a counterbore 13 on the innerface of the jaw. A tubular handle 14 is provided. which extends throughthe bore 12 and is formed with an enlarged head 15, which seats in thecounterbore 13, as shown. This handle is retained in the jaw by means ofa saddle-clip 16, similar to the saddle-clip 8 and secured in a similarmanner, and the tubular handle 14 is provided with internal threads 17.In order to enable the handles 6 and 14 to be rotated, for a purposewhich will appear hereinafter, they are provided with vise-levers 18,having knobs on the extremities thereof, the bars of the said leversbeing slidably mounted in oppositelydisposed openings 19, formed in thehandles.

I provide stems 20 and 21, the extremities whereof are threaded and inengagement with the threads 7 and 17, as indicated. These stems 20 and21 are parallel, as shown, and operate as guides for the movable jaw 2,the said jaw being provided with bores 22, through which the stems passloosely, as shown. On the outer face of the jaw 2, on the side of thestem 20 near the nose 23 of the jaw, a clutch or clutch-plate 24 isprovided, the form of this plate being very clearly shown in .Fig. 3. Itis an elongated oval plate provided at one extremity with an opening 26,through which the stem 20 passes, as shown. This opening is formed uponan axis inclined with respect to the axis of the stem, so that when theclutch-plate occupies the position shown in Fig. 1 the opening 26 willengage the side of the stem at the opposite points 27 and 28. Thisopening 26 is of slightly larger diameter than the stem 20, asindicated. The body of the plate 24 is offset to form a transverse ribor foot 29 of rounded form, which rests against a wear-plate 30,attached to the outer face of the aw, and in this foot is formed an eye31, elongated longitudinally of the plate. The extremity .of the plateremote from the stem is reduced, so as to form a tail 32, and to thistail is attached an inwardly-projecting pin 33, which and through thewear-plate 30. The portion of the clutch-plate which has the opening 26is offset away from the face of the jaw upon which the clutch-plate isattached.

Inorder that the edges of the opening 26 may grasp the stem 20 withgreater firmness, I provide the said opening at opposite points withteeth 37, as indicated in Fig. 3. These teeth are preferably formedbythreading the opening 26 internally and then cuttinglongitudinally-disposed grooves 38 therein thereafter.

On the inner face of the jaw 2 I attach a clutch or clutch-plate 39,which is in all respects similar to the clutch 24 already described. Itstail 40 projects in the same direction as that in which the tail oftheclutch 24 projects, and it is similarly grasped by a spring 41, so thatthe edges of its opening 42 tend to bite into the stem 21, which passesthrough the opening, as indicated in Fig. 1.

With the construction described evidently the clutches 24 and 39normally grasp the stems 20 and 21. When it is desired to slide the jaw2 along the stems to grasp a piece of work 43, it is only necessary forthe mechanic to depress the tails 32 and 40 of the clutches, whereuponthey will rock upon the jaws and release themselves from the stems. Thejaw may then be slid against the work, and the handles 6 and 14 may bethen rotated so as to draw the jaws nearer together. In tightening theclamp in this way it will be found that the clutches 24 and 39effectually prevent any backward movement of the movable jaw 2. In thisconnection attention is called to the fact that the clutches areattached not on the same face of the j aw, but on opposite faces. Thisfeature is advantageous in that it throws the points of engagement ofthe clutches out of the same plane. The greater the tensile forceexerted by the stem 20 the greater will be the force with which theclutch 24 grasps its side, and, similarly, as to the stem 21, it beingunderstood, however, that the force in the stem 21 is a compressiveforce instead of a tensile force. In this connection attention is calledalso to the arrangement for mounting the handles 6 and 14 upon the jaw,which arrangement is such that the heads of the handles are compressedtoward the jaw and not away from the same. For this reason there iscomparatively little strain upon the saddle-plates 8 and 16. The factthat the eyes 31 are elongated longitudinally of the clutch-platesenables the clutchplates to adjust themselves very readily to thepositions of the stems.

Having thus described my invention, I claim as new and desire to securebyLetters Patent- 1. In a clamp, in combination, a jaw, a stem attachedtherein, a second jaw mounted to slide on said stem, a clutch-plateseating on the outer face of said second jaw and adapted to rockthereupon, said clutch-plate having a part offset from the outer face ofsaid jaw and having an opening through which said stem passes, saidclutch-plate affording means for locking said jaw on said stem.

2. In a clamp, in combination, a jaw, a stem attached therein, a secondjaw mounted to slide on said stem, a clutch-plate seating on the outerface of said second jaw and adapted to rock thereupon, said clutch-platehaving a part offset from the outer face of said jaw and having anopening through which said stem passes, said clutch-plate affordingmeans for locking said jaw on said stem, and a spring tending to holdsaid clutch-plate in a position to lock itself upon said stem.

3. In a clamp, in combination, a stem constituting a guide, a jawadapted to slide thereupon, and a clutch-plate attached to the face ofsaid jaw and adapted to rock thereupon, said clutch-plate having aninclined opening therethrough through which said stem passes.

4. In a clamp, in combination, a stem, a jaw adapted to slide thereupon,a clutchplate havin an opening receiving said stem and adapte to graspthe same, said clutchplate having an offset constituting afoot heldagainst sai jaw, said foot having an eye formed therein and a fasteningdevice passing through said eye and securing said clutchplate to saidjaw.

5. In a clamp, in combination, a stem, a jaw adapted to slide thereupon,a clutchplate having an opening through which said stem passes, the ed ewhereof is adapted to bite said stem, sai plate having an offsetconstituting a foot and having an elongated eye therein, a fasteningdevice passing through said eye and securing said plate to said jaw, anda spring engaging said plate and tending to force the same intoengagement with said stem.

6. In a clamp, in combination, a fixed jaw, stems mounted therein, amovable jaw mounted to slide on said stems, a clutchplate mounted on theouter face of said movable jaw, and a second clutch-plate mounted on theinner face of said movable aw, said clutch-plates having openingsrespectively receiving said stems and adapted to bite the same, saidclutch-plates further having projecting tails adapted to be depressed torelease the same.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ERICK R. ERICKSON.

Witnesses:

F. D. AMMEN, JNo. M. BITTER.

IIS

